Leave it to XKCD to whip up an awesome exoplanet infographic [click to embiggen]. I'd petition for Randall Munroe to have it made into a purchasable poster, but at the rate NASA's Kepler Mission is discovering planets beyond our solar system, it wouldn't be long before he had to update it — with way, way more planets.

Planets are turning out to be so common that to show all the planets in our galaxy, this chart would have to be nested in itself—with each planet replaced by a copy of the chart—at least three levels deep.